Fix -Wdocumentation warning: use a correct Doxygen comment marker


git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@176494 91177308-0d34-0410-b5e6-96231b3b80d8
[ELF][Hexagon] fixing test failure

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@176497 91177308-0d34-0410-b5e6-96231b3b80d8